once you get far enough you can use poke park to transfer Pokemon but you will never get them back in leaf green
No but you can transfer from Leafgreen,Firered to HeartGold,SoulSilver then trade to Black,White!
No, you cannot since Pokemon White has newer Pokemon
You can't trade between every single version of Pokémon. You can trade between Pokémon Red, Blue, Yellow, Gold, Silver, Crystal and for the Japanese-only release of Pokémon Green. You can trade between Pokémon Ruby, Sapphire, FireRed, LeafGreen and Emerald. You can trade between Pokémon Diamond, Pearl, Platinum, HeartGold and SoulSilver. You can trade between Pokémon Black and White. in short, you can only trade and battle within generations. so black and white 2 will theoretically be able to trade/battle black and white. you can get pokemon across generations with pal park and poke transfer but you cannot trade over held items.
Yes! You can do that.
yes u can
Yes you can but you can't trade from black to pearl or white to diamond because the games are not compatible with each other because the Pokemon in black and white will come up as ? in the pokedex's of the other games. But you just can't trade to pearl from black or white sorry. However you can trade between black and white using infrared connection. (the other games don't have infrared that's why the game cancels the trade between pearl and black or diamond to black).
No, but you can transfer/trade Pokemon from Diamond to White.
You have to trade a starter to another Pokemon white or black game then trade the Pokemon back.
Yes
You can't you can only send Pokemon from soul silver/heart gold to black or white
After the first badge. But White will only be able to trade to Black or White.
I'm not that sure if you can trade, but you can transfer.